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Q.

If the domain of the function  f(x)=loge(4x2+11x+6)+sin1(4x+3)+cos1(10x+63)  is  (α,β], then 36|α+β| is equal to

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a

63

b

45

c

72

d

54

answer is B.

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Detailed Solution

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(i) 4x2+11x+6>0    x(,2)(34,)

(ii) 4x+3[1,1]     x[1,1/2]

(iii)  10x+63[1,1]      x[910,310]     x(34,12]       α=34,β=12     α+β=54      36|α+β|=45

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